* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

.nav {
  width: 100%;
  height: 50px;
  background-color: #ccc;
  position: fixed;
  bottom: 0rem;
  left: 0rem;
  z-index: 999999;
  bottom: 0px;
  left: 0px;
}

.nav a {
  font-size: 18px;
  color: black;
  text-decoration: none;
  padding: 10px;
  display: inline-block;
  width: 20%;
  text-align: center;
  font-weight: bold;
  text-transform: uppercase;
  transition: all 0.3s ease-in-out;
}

.nav a:hover {
  background-color: #333;
  color: #fff;
}

.face-box {
  width: 100%;
  height: 100vh;
}